| sound(adjective, good, correct, reasonable, reason) |
| valid(adjective, good, sound, right, reasonable) |
| well-rounded(knowledgeable, cultured, educated, erudite, enlightened) |
| well-founded(adjective, good, sound, reason, proper) |
| just(adjective, good, sound, correct, right) |
| reasonable(adjective, sound, correct, reason, proper) |
| cogent(adjective, good, sound, correct, reasonable) |
| rational(adjective, sound, reasonable, reason, forceful) |
| reasoned |
| credible(good, sound, right, reasonable, rational) |
| justified(good, correct, proper, moral, forceful) |
| legal(good, sound, right, reasonable, rational) |
| legitimate(good, sound, correct, right, reasonable) |
| sane(adjective, reason, sane) |
| sensible(adjective, reason, sane) |
| solid(adjective, good, sound, right, reasonable) |
| substantial(good, sound, right, reasonable, rational) |
| good(sound, right, reasonable, rational, genuine) |
| judicious(adjective, reason, knowledgeable, cultured, sane) |
| justifiable(sound, reasonable, rational, logical, understandable) |